CN1754005A - Rotary stirring device for treating molten metal - Google Patents
Rotary stirring device for treating molten metal Download PDFInfo
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- CN1754005A CN1754005A CNA2003801098774A CN200380109877A CN1754005A CN 1754005 A CN1754005 A CN 1754005A CN A2003801098774 A CNA2003801098774 A CN A2003801098774A CN 200380109877 A CN200380109877 A CN 200380109877A CN 1754005 A CN1754005 A CN 1754005A
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- Prior art keywords
- rotor
- gas
- outlet
- molten metal
- axle
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Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 50
- 239000002184 metal Substances 0.000 title claims abstract description 50
- 238000003756 stirring Methods 0.000 title description 3
- 239000007789 gas Substances 0.000 claims description 50
- 238000007872 degassing Methods 0.000 claims description 25
- 229910045601 alloy Inorganic materials 0.000 claims description 19
- 239000000956 alloy Substances 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
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- 230000006872 improvement Effects 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
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- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 150000001638 boron Chemical class 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 159000000000 sodium salts Chemical class 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000003179 granulation Effects 0.000 claims 1
- 238000005469 granulation Methods 0.000 claims 1
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- 230000000052 comparative effect Effects 0.000 description 22
- 238000012360 testing method Methods 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 230000003749 cleanliness Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 3
- 229910000676 Si alloy Inorganic materials 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910003407 AlSi10Mg Inorganic materials 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000004907 flux Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
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- 238000005507 spraying Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- RNFNDJAIBTYOQL-UHFFFAOYSA-N chloral hydrate Chemical compound OC(O)C(Cl)(Cl)Cl RNFNDJAIBTYOQL-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000006023 eutectic alloy Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 244000144992 flock Species 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009497 press forging Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
- B01F23/23311—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
- B01F23/23364—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced between the stirrer elements
- B01F23/233641—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced between the stirrer elements at the stirrer axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/111—Centrifugal stirrers, i.e. stirrers with radial outlets; Stirrers of the turbine type, e.g. with means to guide the flow
- B01F27/1111—Centrifugal stirrers, i.e. stirrers with radial outlets; Stirrers of the turbine type, e.g. with means to guide the flow with a flat disc or with a disc-like element equipped with blades, e.g. Rushton turbine
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
- C22B21/064—Obtaining aluminium refining using inert or reactive gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/07—Stirrers characterised by their mounting on the shaft
- B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
- B01F27/0725—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis on the free end of the rotating axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment gas
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Processing Of Solid Wastes (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a rotary device for dispersing a gas in a molten metal. The device comprises a hollow shaft (20) at one end of which is attached a rotor (22). The rotor (22) has a roof (24) and a base (26) which are spaced apart and connected by a plurality of vanes (32). A compartment (34) is defined between each adjacent pair of vanes (32) and the roof (24) and the base (26), and each compartment (34) has an inlet (36) and first and second outlets (38,40). A flow path is defined through the shaft (20) into the inlets (36) of the compartments (34) and out of the first and second outlets (38,40). Each first outlet (38) is disposed radially outwardly of the respective inlet (36) and arranged to disperse gas laterally of the rotor (22) in use, and each second outlet (40) is disposed in the roof (24) of the rotor (22) and arranged to disperse gas upwardly from the rotor (22) in use.
Description
The present invention relates to handle the rotating stirring device of molten metal.
Known and in molten metal, existed dissolved gases can cause defective in consolidated article.For example, owing to the porous that exists hydrogen to produce causes existing in the foundry goods made by aluminium or its alloy and the press forging product some defectives.For example, hydrogen oozes out into the generation space and discontinuity (for example oxide impurity) can cause generating pore during producing aluminium alloy plate, sheet, reaching band.Also relevant such as other defective of porous in the foundry goods with the existence of hydrogen.
When the aluminium of handling fusing and alloy thereof, the way that often has is to remove hydrogen and solid impurity by using mixture such as chlorine, argon gas, nitrogen or these gases to clean, and described process is commonly referred to " degassing ".A kind of method of finishing the described degassing is to use the quill shaft that has connected rotor.In use, axle and rotor rotate, and gas is scattered in the molten metal by the beam warp rotor downwards.A kind of like this example of assembly is described and is shown in Fig. 1 a in EP0332292 (it is for referencial use that it openly entirely is contained in this paper).Rotor 2 comprises some separation C, and each separation has inlet 9 and exports 10, and each adjacent separation is separated by blade 11.The feature of rotor is: have unlimited chamber M and the outlet that has greater than inlet in its bottom.Rotor is connected in quill shaft through the tubular web member.
The rotor of another prior art is shown in Fig. 1 b, and in the case, some parallel semi-circular channel 100 or groove are arranged in the peripheral cylindrical surface 102 of rotor 104.Path 10 0 down passes to its bottom 104b from the top 104a diagonally opposing corner of rotor 104.In the use, when producing gas, gas passes hole 106, and the center of rotor 104 is vertically passed in hole 106, and gas was discharged the bottom 104b of rotor 104 before the rotor 104 that is rotated disperses.
The purpose of this invention is to provide improved wheelwork, described wheelwork preferably can provide the one or more following advantage above known devices:
(i) degassing quickly,
(ii) more effectively remove solid impurity such as oxide inclusion,
(iii) (ii) have higher wearing quality, and therefore have longer working life because of (i) reaches.
According to the invention provides a kind of wheelwork that is used for disperseing at molten metal gas, described device comprises: one end thereof is the quill shaft of rotor.Described rotor has top or bottom, described top and bottom by the separation of a plurality of partition member be connected; Be formed in each adjacent partition member between and passage between the top and bottom, each passage has inlet and first and second outlet; Be configured the inlet by described axle admission passage and walk out the flowing-path of first and second outlet; Wherein each first outlet is configured to from corresponding inlet radially outwardly and be arranged in use laterally disperse gas from rotor; And wherein each second outlet is configured in the top of rotor, and is arranged in use up disperse gas from rotor.
The present inventor finds uncannily: horizontal towards with last towards the combination of outlet can produce littler and more bubble, this cause with the device of EP0332292 mutually specific energy significantly more effectively outgas and clean, make and when the identical degassing of maintenance/cleaning efficiency, can reduce velocity of rotation, prolong the working life of axle and rotor thus, or under identical spinner velocity, can realize the more effective degassing/cleaning, the possibility that reduces the treatment time is provided.
In one embodiment, rotor is made by whole block material, and top and bottom reach lower area by going up of material block respectively and constitute, and have the hole in the region intermediate of material block, and this hole constitutes passage, and each partition member is made of the region intermediate between each hole.
In described embodiment, each hole can be (inside or outside) homogeneous diameter or taper.Described each hole better is a homogeneous diameter.
In a second embodiment, each partition member is a vane-type, and each passage is the separation that is formed between adjacent each blade.
Be preferably, each second outlet is the otch that the neighboring from the top extends internally.Be easily, described each otch is part circular or semicircular, and better is arranged to symmetrically around rotor.Certainly will be understood that: each otch can be an Any shape, and one or more second outlet can be made of the hole (arbitrary shape) that enters a separation by the top in addition.
In all cases, preferably each second outlet does not extend downwardly into the bottom that reaches rotor.
In preferential embodiment, rotor has second outlet of 4 passages or separation (being made of 4 partition members or blade) and 8 semi-circular cut-out, and described semi-circular cut-out is arranged to symmetrically around rotor (being two otch of each separation).Yet for bigger rotor, the quantity of outlet can increase (for example increasing to 12 or 16), and can reduce for less rotor quantity.
Be preferably, rotor is provided with chamber, and mixing of molten metal and gas can take place in described chamber.Be preferably, described chamber is arranged to from inlet radially inwardly, be preferably in the bottom of rotor and have opening, and among the flowing-path between axle and the inlet, make that in use when device rotated, molten metal was pumped into chamber by the bottom of rotor, it mixes with the gas that feeds the chamber from axle in chamber, metal/gas dispersion before discharging from rotor by first and second outlet, is pumped to each passage or each separation by each inlet then.
Be preferably, each first outlet has the area of section bigger than each inlet.
Be preferably, rotor is circular in the transverse section, and best be to be connected to a center so that the resistance during reducing to rotate.
Be preferably, axle and rotor are separately made, and two portions utilize detachable connection mechanism to link together.Axle can directly be connected in rotor (for example making the screw thread that matches on each and rotor), or for example connects indirectly through threaded tubular web member.
Rotor can be made easily by whole block material (better being graphite), and each separation is made easily by Milling Process.
For fear of query, should know that the present invention also is rotor itself.
The present invention also is to handle the method for molten metal, and described method comprises step:
(i) rotor of apparatus of the present invention and part axle are immersed in the molten metal to be processed,
(ii) rotation axis and
(iii) make one or more treated substances of gas and selection be passed down through axle and enter molten metal, make the metal degassing thus through rotor.
The character of molten metal is unrestricted.Yet the metal that is fit to handle comprises: aluminium and all alloys thereof comprise low silicon alloy (4%～6% silicon), for example BS alloy LM4 (Al-Si5Cu3); Middle silicon alloy (7.5%～9.5% silicon), for example BS alloy LM25 (Al-Si7Mg); Eutectic alloy (10%～13% silicon), for example BS alloy LM6 (Al-Si12); Hypereutectic alloy (＞16% silicon), for example BS alloy LM30 (Al-Si17Cu4Mg); Aluminum magnesium alloy, for example BS alloy LM5 (Al-Mg5Sil; Al-Mg6); Magnesium and alloy thereof, for example BS alloy A Z91 (8.0%～9.5% aluminium) and BS alloy A Z81 (7.5%～9.0% aluminium) and copper and alloy (comprising combarloy, brass, tinbronze, phosphor bronze, lead bronze, gunmetal, xantal and copper-nickel alloy) thereof.
Be preferably, described gas is rare gas element (such as argon gas or nitrogen), and exsiccant preferably.These gases are not thought inert traditionally, but harmless to metal, and also can to use for example be chlorine or chlorating hydrocarbon polymer.Described gas can be the mixture of two or more aforementioned each gases.From the cost of gas and the balance between the inertia, exsiccant nitrogen is preferably.Described method is useful especially for remove hydrogen from the aluminium of fusing.
Will be appreciated that: for any given rotor, the efficient of the degassing will particularly be determined by rotating speed, gas flow and treatment time.Preferably rotating speed be 550rpm (rev/min) or below, and be more preferably 400rpm or following, that best is about 350rpm.Also will be appreciated that: for any given rotor, the size and the geometrical shape that fill the container containing of molten metal will influence best or preferred rotating speed.
As for the degassing, described processing also has the fusing assistant injection that enters melt with inert purge gas concurrently.Then described processing is the combination of the degassing/grain refining and/or improvement and/or cleaning/slagging-off processing, in the case, the treated substance of selection can be the material of granulous cleaning/slagging-off, grain refining, improvement or the mixture of these materials (being commonly referred to " flux " or " fusing assistant ").This fusing assistant can be sodium salt or the strontium (being generally 5%～10% mother alloy) that is used for the titanium and/or the boron salt (for example AlTiB alloy) of grain refining and is used for the aluminum-silicon alloy improvement.These technologies itself are that skilled foundry work is known.
The desired size of rotor, rotating speed, gas flow and (selection) flux amount, all these will be decided by the concrete processing of being taked, and consider simultaneously whether the size of container containing of quality, molten metal of processed metal and geometrical shape, best treatment time and this technology are successive or batch processing.
Referring now to each accompanying drawing only by way of example method embodiments of the invention are described, wherein:
Fig. 1 a is the vertical sectional view of the wheelwork of the prior art described among the EP0332292,
Fig. 1 b and 1c are respectively the side-view and the vertical views of the rotor of another prior art,
Fig. 2 a and 2b are respectively according to the three-dimensional view of wheelwork of the present invention and side-view,
Fig. 3 is the top plan of the wheelwork of Fig. 2 a and 2b,
Fig. 4-the 6th, explain to use according to wheelwork of the present invention and wheelwork relatively before with the nitrogen degassing and afterwards the line chart that reduces of the gas content of AlSi10Mg and
Fig. 7-9 is respectively the Prefil trial curve figure according to the wheelwork of wheelwork of the present invention and two comparisons.
With reference to figure 2 and 3, shown the wheelwork that is used for disperseing gas and/or other treated substance at molten metal.Described device comprises: have the axle 20 of through hole 20a, rotor 22 and tubular web member 23.
See that as can be from Fig. 3 easier the peripheral edge at the top 24 of rotor 22 is provided with the otch 40 of a plurality of (being 8 in the present embodiment) part circular along 22a.Each otch 40 is as second outlet of its corresponding separation 34 (each separation 34 is provided with 2 otch 40 in the case).
An end at axle 20 is shaped on suitable threaded region 20b, be used for axle 20 is fixedly mounted in web member 23, another end of axle 20 is connected in the bottom of the drive shaft (not shown) of hollow, it (is an electric motor in the case that the upper end of quill shaft is connected in drive unit, not shown), and the drive shaft of axle 20 hole 20a by hollow is connected in source of the gas (not shown).
From the above description, thing will be very clear, the successive flowing-path is present in: by axle 20 hole 20a and web member 23, the top 24 by rotor 22 enters chamber 30, enters separation 34 and walks out rotor 22 by first and second outlet 38,40 by ingate 36 from source of the gas.
In use, rotor and shaft assembly are dipped into (for example in the ladle that refractory liner is arranged or other container) in the molten metal that will outgas, and rotate with desirable speed under the effect of electric motor.Source of the gas is opened and is adjusted to desirable flow, and finishes the degassing in predetermined pitch time.
During the degassing, gas is passed down through axle 20 and enters rotor chamber 30, and it mixes with the molten metal that upwards is pumped into chamber 30 in chamber 30.Gas/metal dispersion flows also 36 enters separation 34 through entering the mouth, and laterally by first outlet 38 with up by second outlet, 40 outflow rotors 22.
Example 1-3
The rotor as above-mentioned of diameter 190mm is used to remain on the degassing of AlSi10Mg alloy of 720 ℃ 200Kg.The gas that uses is the drying nitrogen of flow as 15L/min.Rotating speed was 450rpm, finished the degassing (example 1) through 5 minutes.By determined before handling and after density metal index (DI) evaluate the efficient of rotor.Calculate DI with following formula:
Herein, Datm is the density of the metal sample that can under atmospheric pressure solidify, and D80mbar is the density of the sample that can solidify under vacuum tightness 80mbar.The DI value of sample is high more, and the hydrogen content of metal is just high more.
Except the rotating speed that uses is 350rpm (example 2: in 5 minutes treatment times, do 2 times; Example 3: in 3 minutes treatment times, do 2 times) outside, finishes example 2 and 3 as example 1.
Comparative example 1-3
In order to compare, the top of removing rotor is not provided with outside any otch, for the corresponding example of use with example 1 identical rotor, finishes the degassing under the same conditions.
The result
(DI) reduces the aspect about density index, and its results list is as follows, and represents with figure line in Fig. 3-5 (each examples/comparative examples 1-3).Can have identical initial DI exactly though be appreciated that the material that does not have two batches of fusings, easily demonstrate: rotor of the present invention provides the significant improvement that surpasses comparable rotor, and described comparable rotor has each otch of the expression of being omitted.For example, can see from table 2 and Fig. 3: after processing, the D I of example 2 (twice operation) is half of comparative example 2, even (operation 2) also is like this when initial D I is higher.
Table 1:DI (%) (450rpm, 15L/min is through the 5mins degassing)
| Example 1 | Comparative example 1 | |
| Before | 8.43 | 10.15 |
| Afterwards | 0.38 | 0.76 |
Table 2:DI (%) (350rpm, 15L/min is through the 5mins degassing)
| Example 2 | Comparative example 2 | ||
| The 1st operation | The 2nd operation | ||
| Before | 4.58 | 6.92 | 5.34 |
| Afterwards | 0.38 | 0.38 | 0.76 |
Table 3:DI (%) (350rpm, 15L/min is through the 3mins degassing)
| Example 3 | Comparative example 3 | |||
| The 1st operation | The 2nd operation | The 1st operation | The 2nd operation | |
| Before | 6.08 | 2.66 | 4.98 | 7.66 |
| Afterwards | 0 | 0.38 | 1.15 | 1.89 |
When the degassing time reduced, relatively the efficient of rotor reduced (comparative example 3), and rotor of the present invention (example 3) on ID keeps significantly reducing.
Example 4 and comparative example 4 and 5
The LM25 melt of 250Kg is made in burning the stove that in batches takes out of geseous fuel.The material package of loading is drawn together the mixture of new blank and scrap stock.Rotor in each test is contained on the machine in proper order, and described machine can be controlled lance rotation speed and rare gas element spraying pressure.For example 4 and comparative example 4, speed setting is 350rpm, and is 550rpm (rotating speed of manufacturer recommendation) for comparative example 5.Rare gas element uses nitrogen, and that spraying pressure keeps in whole test is constant.
Each rotor is finished 3 degassing operations.Each initial, the contents level of gas in metal is by the accurate Faseco Hydral[TM of amount] gassed out zone immerses melt and comes lifting artificially.Also expect to go to reduce the metal cleanliness that the oxide compound by minute cleaved surface causes by the turbulent flow that this operation produces.
For each 15 minutes total time, the above-mentioned degassing operates in 5 minutes and finishes in the increment.Provide density index value at each initial and per 5 minutes ends at interval with MK 3VT Vacuum Density Unit (MK GmbH-MK 3VT vacuum density unit).Also used 3Alscan[TM aspect the number of times of direct measurement hydrogen content selecting to provide] the hydrogen analyser.Use Prefil and measure metal cleanliness in initial and per 15 minute cycle.
Prefil (Pressure Filtration-filtering under pressure) test has provided the online quantified measures of oxide films and other inclusion.Under steady temperature and pressure, monitor the flow of molten metal, and be used to draw the line chart of filtering weight the time by microfilter.At duration of test, be accumulated in filter surfaces soon such as inclusion in the metal of oxide films, reduced flow by strainer.Therefore, filtering weight has been indicated the contents level that is present in the inclusion in the metal to the gradient and the overall shape of the curve of time.The initial slope of oxide films influence curve (20～30 seconds).They represent with straight line, and described straight line has with oxide films and increases and the gradient that reduces.Such as TiB
2, thin Al
2O
3Or the particulate inclusion of carbide makes the curve off-straight in the Prefil test.The point that begins to depart from initial slope from curve can be extrapolated fine grain loading capacity.
Except that filtration curve, the type of the inclusion in the metal sample that will implement to test can be discerned and quantitatively be present in to the metallography analysis that is deposited in the residuum on the strainer after the Prefil test.
Example 4
Rotor as mentioned above and be similar to example 1, but have 140mm than minor diameter.
Comparative example 4
Rotor is as employed among the comparative example 1-3, but diameter is 140mm.
Comparative example 5
Rotor has the 140mm diameter shown in Fig. 1 b.
The result
Density index
The test of the DI value in the table 4 shows: the rotor of example 4 is similar to the rotor of comparative example 5 on degassing efficiency, and in the beginning of operating 5 minutes, both outgas melt fast, only have small improvement, if any; Obtained improvement other 5 minutes the time continuing to outgas.But the low working speed of example 4 rotors has good action to rotor/jet pipe life-span.
The rotor of comparative example 4 is degassers of minimum efficiency.Compare it with other two rotors and reach low density index with the longer time, and obtain Schwellenwert 2.5% after 15 minutes, it is accessible to be higher than other two rotors significantly: after 15 minutes＜0.75%.
The step-down power test that is used to estimate the gas porous tendency of melt is to use the simple experiment of robust equipment.Yet it can not directly measure hydrogen content, and it is responsive for restive variable; These variablees are in this way all: the difference of sample thief aspect between each operator, and the variation of metal cleanliness (gas is separated out nuclear) aspect, or even from the vibration of cell floor.Alscan has provided the direct measuring method of hydrogen content, and irrelevant with these variablees.Good corresponding relation (not providing data) is arranged between Alscan method of masurement under laboratory condition and the density index.
Table 4
| Time | Example 4 | Comparative example 4 | Comparative example 5 | |
| DI | DI | DI | ||
| The | 0 | 9.54 | 23.35 | 12.98 |
| 5 | 2.26 | 10.65 | 1.51 | |
| 10 | 0.75 | 4.89 | 0.75 | |
| 15 | 0.75 | 3.01 | 0.75 | |
| The | 0 | 8.37 | 11.03 | 5.68 |
| 5 | 0.76 | 5.66 | 0.38 | |
| 10 | 0.75 | 3.75 | 0.38 | |
| 15 | 0.75 | 2.63 | 1.13 | |
| The | 0 | 6.08 | 14.83 | 4.55 |
| 5 | 0.75 | 7.92 | 1.14 | |
| 10 | 0.75 | 2.55 | 0.38 | |
| 15 | 0.75 | 2.62 | 0.38 |
Metal cleanliness
The curve of drawing for rotor is shown among Fig. 7-9.The rotor curve (Fig. 9) of comparative example 5 shows: after degassing operation in 15 minutes, the degree of cleaning of molten metal worsen always.Off-straight when curve overturns shows owing to oxide films makes the strainer obstruction that becomes.The observation of doing during this Pass Test, promptly this rotor has caused tangible turbulent flow and melted surface has been wrapped in a large amount of metals.
The curve that example 4 and comparative example 4 (being respectively Fig. 7 and Fig. 8) obtain more thickly flocks together.In some example, because the result of the degassing, metal cleanliness improves, and in other example, it degenerates a little.Yet be apparent that: the curve ratio that is obtained by two rotors has a steeper gradient by what comparative example 5 obtained, and they can not divide upset same degree, shows the lower aq level of oxide compound.These results are considered to: the rotor of example 4 (with comparative example 4) is to not significantly effect of metal cleanliness (favourable or deleterious).
Used the rotor of comparative example 5 under rotating speed 350rpm, to carry out further test.Bubble form has changed fully, and big bubble appears on the surface of melt, and metal is thrown into common casting area from stove simultaneously.Test for reasons of safety and abandoned.
Claims (22)
1, be used for disperseing at molten metal the wheelwork of gas, described device comprises: an end is the quill shaft of rotor, and described rotor has top and bottom, and described top and bottom connects separately and by a plurality of partition members; Be formed in the passage between every pair of adjacent partition member and the top and bottom, each passage has inlet and first and second outlet; Formation is by the inlet of axle admission passage and from first and second flowing-path that exports out; Wherein each first outlet is radially outside from corresponding inlet, and is arranged in use laterally disperse gas from rotor; And wherein each second outlet is configured in the top of rotor, and is arranged in use up disperse gas from rotor.
2, rotor as claimed in claim 1, it is characterized in that: rotor is made by the monoblock material, and top and bottom are made of the lower area that upward reaches of piece material respectively, have the hole in the region intermediate of piece material, described hole constitutes passage, and each partition member is made of the region intermediate between each hole.
3, rotor as claimed in claim 2 is characterized in that: the diameter in each hole is consistent.
4, rotor as claimed in claim 1 is characterized in that: each partition member is foliated, and each passage is the separation that is configured between each adjacent blades.
5, any device in the claim as described above is characterized in that: each second outlet is the otch that the neighboring from the top extends internally.
6, device as claimed in claim 5 is characterized in that: each otch is part circular or semicircular, and better is arranged to symmetrically around rotor.
7, any device in the claim as described above, it is characterized in that: second outlet not have extension downwards as far as the bottom of rotor.
8, any device in the claim as described above, it is characterized in that: rotor has 4 passages that are made of 4 partition members, has 8 second outlets of semi-circular cut-out form simultaneously, and each semi-circular cut-out is arranged to center on symmetrically rotor.
9, any device in the claim as described above, it is characterized in that: rotor is provided with chamber, and mixing of molten metal and gas can take place in described chamber.
10, the device of claim 9 as described above, it is characterized in that: chamber is arranged to from inlet radially inside, and has opening in the bottom of rotor, make in use when device rotates, molten metal is pumped into chamber by the bottom of rotor, it mixes with the gas that penetrates chamber from axle in chamber, and metal/gas dispersion before discharging from rotor by first and second outlet, is pumped in each passage by each inlet then.
11, any device in the claim as described above, it is characterized in that: this first outlet has the cross-sectional area bigger than described inlet.
12, any device in the claim as described above, it is characterized in that: rotor is circular on cross section, and better is the center that is connected in axle.
13, any device in the claim as described above, it is characterized in that: axle and rotor are separately made, described the two link together by dismountable stationary installation.
14, any device in the claim as described above, it is characterized in that: rotor is made by monoblock graphite.
15, the method for processing molten metal comprises step:
(i) rotor of each device among the claim 1-14 and part axle are immersed in the molten metal to be processed;
(ii) rotate described axle and
(iii) make one or more treated substances of gas and selection be passed down through axle and enter molten metal, make the metal degassing thus through rotor.
16, as the method for claim 15, it is characterized in that: processed metal to be selected from aluminium, magnesium, copper and their alloy.
17, as the method for claim 15 or 16, it is characterized in that: the gas that uses in (iii) in step is selected from one or more in following group: muriate, chlorating hydrocarbon polymer, nitrogen and argon gas.
18, as the method for claim 17, it is characterized in that: the gas that uses in (iii) in step is exsiccant nitrogen.
19, as each method among the claim 15-18; it is characterized in that: described processing comprises: grain refining and/or improvement and/or clean, and the treated substance of step selection (iii) is the material of cleaning/slagging-off, grain refining and/or the improvement of granulation.
20, as the method for claim 19, it is characterized in that: the treated substance of selection is selected from one or more in following group: titanium salt and/or boron salt, sodium salt and strontium mother alloy.
21, as each method among the claim 15-20, it is characterized in that: the rotating speed of step in (ii) is 400rpm or following.
22, be used for as the rotor in each the wheelwork of claim 1-14, described rotor comprises: top and bottom, and described top is connected separately and by a plurality of partition member with the bottom; Be configured in the passage between every pair of adjacent partition member and top and the bottom, each passage has gas inlet and first and second pneumatic outlet; Wherein each first outlet is radially outward disposed from corresponding inlet, and is arranged in use laterally disperse gas from rotor; And wherein each second outlet is configured in the top of rotor, and is arranged in use up disperse gas from rotor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0229871.9 | 2002-12-21 | ||
| GB0229871A GB2396310A (en) | 2002-12-21 | 2002-12-21 | Rotary device with vanes for dispersing a gas in a molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1754005A true CN1754005A (en) | 2006-03-29 |
| CN100342043C CN100342043C (en) | 2007-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801098774A Expired - Lifetime CN100342043C (en) | 2002-12-21 | 2003-12-17 | Rotary stirring device for treating molten metal |
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|---|---|
| US (1) | US7669739B2 (en) |
| EP (1) | EP1573077B1 (en) |
| JP (1) | JP2006511705A (en) |
| CN (1) | CN100342043C (en) |
| AT (1) | ATE338147T1 (en) |
| AU (1) | AU2003295124B2 (en) |
| CA (1) | CA2511435C (en) |
| DE (1) | DE60308064T2 (en) |
| DK (1) | DK1573077T3 (en) |
| ES (1) | ES2271678T3 (en) |
| GB (1) | GB2396310A (en) |
| MX (1) | MXPA05006559A (en) |
| PT (1) | PT1573077E (en) |
| WO (1) | WO2004057045A1 (en) |
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| CN106119563A (en) * | 2016-08-02 | 2016-11-16 | 宁波科达工贸股份有限公司 | A kind of method of aluminum liquid degasification |
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| CN107073564A (en) * | 2014-08-20 | 2017-08-18 | 曾·卡西纳斯 | Apparatus and method for the processing of high shear liquid metals |
| CN107406907A (en) * | 2015-03-13 | 2017-11-28 | 伦敦布鲁内尔大学 | Purify alloy melt |
| CN108057360A (en) * | 2017-12-27 | 2018-05-22 | 杨丽君 | A kind of molten metal alloy melt stirring device of vacuum automation |
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| PL2017560T3 (en) * | 2007-07-05 | 2010-05-31 | Foseco Int | Rotary stirring device for treating molten metal |
| US9127332B2 (en) * | 2008-03-11 | 2015-09-08 | Pyrotek, Inc. | Molten aluminum refining and gas dispersion system |
| CN101892379B (en) * | 2010-06-18 | 2011-05-11 | 新星化工冶金材料(深圳)有限公司 | Magnesium alloy melt stirring device |
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| EP2756879B1 (en) * | 2013-01-22 | 2016-06-08 | Kunze, Silvia | Apparatus for introducing gas into a liquid |
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| JP6667485B2 (en) * | 2017-10-20 | 2020-03-18 | 株式会社豊田中央研究所 | Recycling method of Al alloy |
| JP2019178368A (en) * | 2018-03-30 | 2019-10-17 | アイシン・エィ・ダブリュ株式会社 | Aluminum alloy member and manufacturing method of aluminum alloy member |
| WO2023046701A1 (en) * | 2021-09-21 | 2023-03-30 | Foseco International Limited | Rotary device for treating molten metal |
| WO2024062216A1 (en) * | 2022-09-23 | 2024-03-28 | Foseco International Limited | Rotary device for treating molten metal |
| TWI823620B (en) * | 2022-10-14 | 2023-11-21 | 中國鋼鐵股份有限公司 | Stirring device with double rotors |
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| US3227547A (en) | 1961-11-24 | 1966-01-04 | Union Carbide Corp | Degassing molten metals |
| US3849119A (en) * | 1971-11-04 | 1974-11-19 | Aluminum Co Of America | Treatment of molten aluminum with an impeller |
| GB1410898A (en) * | 1973-02-16 | 1975-10-22 | Union Carbide Corp | Apparatus and process for refining molten aluminium |
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| JPH0233780B2 (en) | 1988-04-08 | 1990-07-30 | Nippon Pillar Packing | YOJUKINZOKUNOFUJUNBUTSUJOKYOYOKAITENNOZURU |
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-
2002
- 2002-12-21 GB GB0229871A patent/GB2396310A/en not_active Withdrawn
-
2003
- 2003-12-17 CN CNB2003801098774A patent/CN100342043C/en not_active Expired - Lifetime
- 2003-12-17 AT AT03786125T patent/ATE338147T1/en active
- 2003-12-17 DE DE60308064T patent/DE60308064T2/en not_active Expired - Lifetime
- 2003-12-17 CA CA2511435A patent/CA2511435C/en not_active Expired - Lifetime
- 2003-12-17 AU AU2003295124A patent/AU2003295124B2/en not_active Expired
- 2003-12-17 MX MXPA05006559A patent/MXPA05006559A/en active IP Right Grant
- 2003-12-17 DK DK03786125T patent/DK1573077T3/en active
- 2003-12-17 PT PT03786125T patent/PT1573077E/en unknown
- 2003-12-17 WO PCT/GB2003/005492 patent/WO2004057045A1/en active IP Right Grant
- 2003-12-17 ES ES03786125T patent/ES2271678T3/en not_active Expired - Lifetime
- 2003-12-17 EP EP03786125A patent/EP1573077B1/en not_active Expired - Lifetime
- 2003-12-17 JP JP2004561626A patent/JP2006511705A/en active Pending
- 2003-12-17 US US10/540,152 patent/US7669739B2/en active Active
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| CN107073564A (en) * | 2014-08-20 | 2017-08-18 | 曾·卡西纳斯 | Apparatus and method for the processing of high shear liquid metals |
| CN107073564B (en) * | 2014-08-20 | 2020-03-03 | 曾·卡西纳斯 | Apparatus and method for high shear liquid metal processing |
| CN107406907A (en) * | 2015-03-13 | 2017-11-28 | 伦敦布鲁内尔大学 | Purify alloy melt |
| CN106119563A (en) * | 2016-08-02 | 2016-11-16 | 宁波科达工贸股份有限公司 | A kind of method of aluminum liquid degasification |
| CN106907937A (en) * | 2017-03-22 | 2017-06-30 | 珠海肯赛科有色金属有限公司 | A kind of gyratory agitation device for the gas dispersion in fusing metal |
| CN108057360A (en) * | 2017-12-27 | 2018-05-22 | 杨丽君 | A kind of molten metal alloy melt stirring device of vacuum automation |
| CN113909451A (en) * | 2021-10-13 | 2022-01-11 | 宁波众创智能科技有限公司 | Continuous on-line degassing quantitative furnace |
| CN113909451B (en) * | 2021-10-13 | 2023-09-29 | 宁波众创智能科技有限公司 | Continuous on-line degassing quantitative furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2511435C (en) | 2010-09-07 |
| PT1573077E (en) | 2006-11-30 |
| JP2006511705A (en) | 2006-04-06 |
| GB0229871D0 (en) | 2003-01-29 |
| GB2396310A (en) | 2004-06-23 |
| US7669739B2 (en) | 2010-03-02 |
| EP1573077A1 (en) | 2005-09-14 |
| MXPA05006559A (en) | 2005-08-16 |
| CA2511435A1 (en) | 2004-07-08 |
| AU2003295124B2 (en) | 2009-06-11 |
| US20090071294A1 (en) | 2009-03-19 |
| EP1573077B1 (en) | 2006-08-30 |
| WO2004057045A1 (en) | 2004-07-08 |
| ATE338147T1 (en) | 2006-09-15 |
| DK1573077T3 (en) | 2007-01-02 |
| CN100342043C (en) | 2007-10-10 |
| DE60308064D1 (en) | 2006-10-12 |
| ES2271678T3 (en) | 2007-04-16 |
| DE60308064T2 (en) | 2007-04-12 |
| AU2003295124A1 (en) | 2004-07-14 |
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